Micrometer-gage.



A. C. NIELSEN.

M|CROMETER GAGE.

APPLICATION FILED AUG-2, 191s.

1,226,574. Patented May15, 1917.

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ANDREAS C. NIELSEN, 0F CLEVELAND, OHIO.

MICROMETER-GAGE.

Specification of Letters Patent.

Patented May 15, 191 7.

Application filed August 2, 1916. Serial No. 112,745.

7 '0 all whom it may concern Be it known that I, ANDREAs C. NIELSEN, citizen of the United States, residing at Cleveland, in the county of Guyahoga and State of Ohio, have invented certain new and useful Improvements in Micrometer- Gages, of which the following is a specification.

This invention relates to micrometer gages, and has for its object to provide an improved inside and height gage. To adapt the tool for either use a detachable base block is provided, on which the micrometer stands when measuring height, and a detachable anvil is also provided, which may be substituted for the block for inside measurement. Since the wear on the anvil will naturally be greater than that on the block, means are provided for adjusting the anvil for accuracy, as hereinafter explained.

In the accompanying drawings,

Figure l is a side elevation of the device used as a height gage.

Fig. 2 is a similar view as an inside gage.

Fig. 3 is a section of the base block used on the height gage.

Fig. 4 is a section of the lower end of the micrometer.

Fig. 5 is a section of the detachable cap and anvil used for inside measurements.

Fig. 6 is an end view of the cap.

Referring specifically to the drawings, 7 indicates a micrometer having a suitably graduated sleeve 8 telescoped within the graduated thimble 9. The lower end of the thimble 9 has pressed therein a threaded post 10 upon which the sleeve 8 is screwed. The thimble 9 and post 10 are thus fixed to each other,*and the lower or outer end of the post 10 is orovided with a central threaded bore 12 and an annular recess or shoulder 13.

15 is a block with parallel faces and a screw stem 14 which, when the micrometer is used as aheight gage, is screwed into the bore 12, with the block against the end of the thimble 9, as shown in Fig. 1. The bottom surface 15 of the block "is thus at a right angle to the axis of the micrometer,

and presents a continuous flat surface over the full area of the base.

When it is desired to use the instrument as an inside micrometer the cap 16 is sub stituted' for the base block. This cap 16 has a threaded stem 17, and a shoulder 18 which seats within the recess 13, the threaded stem 17 screwing into the bore 12 in the post 10. The cap 16 also has a threaded central bore 18 and a cross groove 19, to receive a spanner wrench, and this bore 18- receives the threaded stem 21 of an anvil 20 which has a friction surface 22 to hold the same at adjustment and fiattened sides 23 on which a wrench or pliers may be used to adjust the same. The groove 19 enables the cap to be placed or removed by means of a spanner wrench;

In order to maintain a precise distance such as A between the points of the instrument, adjustment for wear must be provided, as it is obvious that the wear on the point 20 will be greater than on the contact surface 15 of the block 15. Accordingly the anvil may be screwed in or out to secure an exact setting as respects the distance A on the drawing, the anvil being held at adjustment by the contact of its friction surface 22 against the surface in the bore in the cap.

It will be noticed that the surface 15 of the base block is continuous, so that it measures directly in line with the axis of the instrument, thereby presenting a substantially solid mass between the upper contact point of the micrometer and the surface of the block, being in that respect superior to those blocks having a hole or cavity at the ax1s.

That I claim as new is:

A convertible height and inside micrometer gage, comprising an outer thimble, a threaded post secured in one end of the thimble, and a graduated sleeve mounted on the inner end of the post, within the thimble, the outer end of the post having a threaded bore adapted for the attachment of either a base block or an anvil member.

In testimony whereof, I do affix my signature in presence of two witnesses.

ANDREAS C. NIELSEN.

Witnesses:

JOHN A. BOMMHARDT, S. W. BRAINARD.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

' Washington, no. 

